Faculté des sciences

The enthalpies of immersion of active carbons, in relation to the Dubinin theory for the volume filling of micropores

Stoeckli, Fritz ; Kraehenbuehl, F.

In: Carbon, 1981, vol. 19, no. 5, p. 353-356

It is shown that an exact expression can be derived from Dubinin's theory, for the enthalpy of immersion of active carbons. It appears that for a given liquid, the specific enthalpy of immersion is a function of the characteristic energy βE0 of the Dubinin-Astakhov equation. The new relation is illustrated by data obtained for 10 different carbons immersed into benzene and... More

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    Summary
    It is shown that an exact expression can be derived from Dubinin's theory, for the enthalpy of immersion of active carbons. It appears that for a given liquid, the specific enthalpy of immersion is a function of the characteristic energy βE0 of the Dubinin-Astakhov equation. The new relation is illustrated by data obtained for 10 different carbons immersed into benzene and n-heptane at 34°C. Simultaneously, results are presented for the immersion into water, not described by Dubinin's theory, but providing useful complementary information about the chemical state of the surface.